Leslie F. Boord

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Elizabeth, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Respirator pressure-demand exhalation valve
- Patent number 4,007,758
- Issue date Feb 15, 1977
- Mine Safety Appliances Company
- Robert E. Gray
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...